Chandra Observations of Coronal Emission from the Early G Supergiants α and β Aquarii

Details Chandra Observations of Coronal Emission from the Early G Supergiants α and β Aquarii Chandra Observations of Coronal Emission from the Early G Supergiants α and β Aquarii

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...627l..53a&link_type=abstract

The Astrophysical Journal, Volume 627, Issue 1, pp. L53-L56.

Astronomy and Astrophysics

Astronomy

7

Stars: Coronae, Stars: Individual: Henry Draper Number: Hd 31910, Stars: Individual: Henry Draper Number: Hd 159181, Stars: Individual: Henry Draper Number: Hd 204867, Stars: Individual: Henry Draper Number: Hd 209750, X-Rays: Stars

Scientific paper

We report Chandra detections of coronal X-rays from the early G supergiants α Aquarii (HD 209750: G2 Ib) and β Aquarii (HD 204867: G0 Ib). Previous ROSAT observations of these archetypical ``hybrid chromosphere'' stars were inconclusive, in the case of α Aqr owing to a 38' mispointing, and for β Aqr because of a small positional discrepancy of the apparent source. The Chandra High Resolution Camera (HRC-I), with its superior spatial resolution and sensitivity, has obtained a positive detection of α Aqr and recovered faint emission at the location of β Aqr, now well separated from the stronger source to the southeast that dominated the earlier ROSAT image. The coronal LX/LC IV luminosity ratios of both supergiants are extremely depressed relative to early G main-sequence stars, continuing the ``X-ray deficiency syndrome'' originally identified in late F/early G luminosity class III giants of the Hertzsprung gap.

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